What type of insulation rating is generally required for wiring in a residential attic?

The requirement for insulation rating in wiring located in a residential attic is typically focused on ensuring safety and compliance with building codes related to environmental conditions such as temperature and exposure to potential moisture. Type NM-B (non-metallic sheathed cable) is designed for residential applications and is suitable for use in attics where the environment does not involve direct exposure to water or excessive heat. Type UF (underground feeder) cable, while typically used for underground applications, is rated for wet locations and can also be utilized in attics, providing added flexibility under specific circumstances.

Both of these types are well-suited for residential installation due to their ability to withstand the conditions found in attics and to provide reliable protection against wear and moisture. This makes them the correct choices when considering insulation requirements for wiring in such residential areas.